Method of making insulators



Oct. 27 1 25. 1,558,498

J. M. PECK El AL METHOD OF MAKING INSULATORS Filed llay 12. 1922 E BY nrromvzy Patented Oct. 27, 1925.

UNITED STATES PATENT OFFICE.

JOHN M. PECK,.GORNELIUS VAN DYKE BENNETT, AND JAMES W. RYAN, OF LIMA, NEW YORK, ASSIGNORS TO THE PORCELAIN INSULATOR CORPORATION, OF LIMA, NEW

YORK, A GOBPOBA'I'ION OF NEW YORK.

METHOD OF MAKING INSULA'IORS.

Application filed May 12, 1922. Serial No. 560,453.

To aZZ whom it may concern:

Be it known that we, JOHN M. PEoK, Con- NnLrUs VAN DYKE BENNETT, and JAMES W. RYAN, all citizens of the'United States of America, residing at Lima. in the county of Livingston and State of New York, .have invented certain new and useful Improvements in Methods ofMaking Insulators, of

. which the following is a specification.

Thevinvention relates to the manufacture of sectional type insulators, wherein one section is arranged within another, as for instancein pin type insulators, and one of the chief purposes is to provide a structure in which the several sections are heldtogetherrigidly, so as to effectually resist any strain or pressure that may ordinarily be imposed, and thus affording an insulator of highest etficiency;

A further object of the invention is to construct the sections of the insulator in such manner. and to secure them together by mechanism and according to a method that simplifies the manufacture and materially reduces the final cost.

The improvements are applicable more especially to insulators of the type embodving two or more sections. each consisting of a hollow body portion closed at one end. av

skirt portion, and a base portion extending beneath the skirt portion, and the method involves briefly the following steps:

First, forming the sections so that the bottom of the base portion of an outer section terminates somewhat above the top of the skirt portion of the adjacent inner section.

Second. forming a recess upon the inner surface of the side of the outer section adjacent to the base portion. so that the recess communicates with the space between the bottom of the base of the outer section and the top of the skirt of the adjacent inner section:

Third, placing a resilient filling cement or seal in the bottom or against the end wall of the outer section, and then nesting the inner section within the outer section. pressing them together tightly, and'permitting the resilient seal to cool and harden.

Fourth, forcing a. non-resilient cement, preferably under pressure, through the s ace between the sections and in the recess a ove mentioned.

a pin type insulator, constructed in accordance with a preferred embodiment of the invention;

Figure 2 is a side elevation of a mechanism adapted for assembling the sections,

and

Figure 3 is a sectional view. partially in elevation, of a mechanism which is used in forcing the non-resilient cement between the sections.

The invention can be applied to various forms of sectional insulators, and the disclosure of this application is intended merely to illustrate an example of different practical forms. In the construction shown, there are'two sections designated generally at A and B, although the principles set forth are likewise applicable to insulators having three or more sections. I

The sections are constructed with hollow body portions closed at one end as indicated at A and B, and include skirt portions A and B The body portion of the section A terminates in a base portion A, the section B being arranged for attachment directly to the supporting pin, as well known in this class of insulators.

The sections are formed with suflicient play between the side walls to permit the ready insertion of-the inner section within the outer section, and it is desirable to prevent the non-resilient cement, that is used to secure the sections together, from coming in contact with the end of the section B, or a greater portion of the side walls than actually necessary to attach the sections. To accomplish this, we employ a filling or sealing means, of some resilient material, as designated at A. A successful material for this purpose is a resilient cement of an asphaltic nature, which may be oured into one section before nesting. The resilient cement, or seal A, completely fills the space between the sections, preventing access of the non-resilient cement A, and thus preventing the insulator from breaking under strains. .set up by expansion and contraction of cement between the sections, particularly at the corners A, where great strain usually occurs. I

In order to secure the sections together, the base portion A is formed so as to terminate somewhat above the top of the underlying skirt portions 13, thereby affording the space a, and w designates a recess or pocket formed on the inner surface of the side of section A at a point adjacent to the base portion A The recess it extends from the bottom of the baseportion partially along the side of the section, but only far enough to secure an efficient union. This leaves a substantial part of the space between the side walls of the sections filled with the resilient cement, or sealin means A, resulting in a tight attachment etween the sections, while at the same time permitting expansion and contraction, and preventing destruction of the insulator, due to expansion strains across the space occupied by the resilient filler.

A suitable non-resilient cement is placed in the recess 0/, preferably by forcing it in under pressure, and the walls of the recess may be grooved: as indicated, or otherwise roughened, to cause the cementing medium to adhere more firmly. The non-resilient cement, however, does not enter beyond the recess a, being held against further movement between the sections by the seal A.

The preferred method of assembly is as follows: the section A is placed in inverted position, and a small amount of hot, liquid, resilient cement, such as an asphaltic composition, is poured into its hollow interior, in sufiicient amount to lightly cover the bottom thereof in a thin layer. The section B is then placed within the section A, and forced downwardly therein, preferably by an apparatus such as illustrated in Figure 2, which serves to properly center the sections with reference-toeach other, and to enable readily applying the necessary pressure. As the sections are forced together, practically all of the resilient cement is squeezed outwardly-toward the side walls and out of engagement with the end wall, and the space between the side walls as well as the curved corner portions A is thus filled by the resilient cement, as indicated at A in Figure 1. Upon contact with the insulatorsections, the cement just described quickly cools and hardens and forms an effective seal between the side walls of the sections. Thereafter, the sections are attached together bya non-resilient cement that is forced, preferably under pressure, into the space between the pocket a of the outer section and the opposite portion of the side wall of the inner section, thecement used in this instance being applied through the space a between the sections, and preferably by means of an apparatus such as shown in Figure 3.

Referring now to Figure 2, C designates a stationary member that is recessed to receive the insulator section A when inverted, and C is a vertically movable member that is recessed to receive the section B when inverted. The recesses in said members C and C are arranged so as to insure proper centering of the sections, and an even spacing between the side walls thereof, so that the operator places the section A in the recess in the lower section C, and holds the section B lightly in the recess in the upper member C as the latter is moved downwardly under pressure. To effect this latter operation. the member C is mounted on a vertical rod D, pivoted upon a lever E which in turn is pivoted to a standard E. F is a spring which acts normally to retain the rod D and member C in uppermost position, as shown in Figure 2. F is a controlling foot lever, and G is a con necting rod extending from the foot lever F to the lever E, so that the operator, to apply the necessary pressure between the sec tions after the resilient cement is poured into the outer section, depresses the footlever F against the action of spring F, and by holding the foot lever F down for an instant, suflicient pressure is applied to force the resilient cement outwardly between the side walls substantially as shown in Figure 1.

To apply the non-resilient cement that is used for the attachment of the sections, the insulator is placed in inverted position on a rotary table H in the manner shown in Figure and one operator slowly turns the insulator and the table, while a second operator forces in the cement, by means of a hand device such as the common type of grease gun. or any other convenient mecha- IllSl'I].

Instead of using a cement as the sealing means, we may employ any resilient filler to occupy the space between the sections beyond recess a, and to prevent entrance of the non-resilient cement, and in this and other respects the invention is not limited to the precise costruction or method of assembly set forth, but may be modified in various ways without departing from the fundamental features of the improvements, and this application is intended to cover any changes or departures coming within the intended purposes of the invention or the scope of the following claims.

We claim:

1. The method of constructing an insulator formed of a plurality of hollow porcelain sections, consisting of first placm a resilient cement within the outer section, nesting the sections and applying pressure thereto to squeeze the resilient cement out- \vardly and bring the sections close together, and then inserting a non-resilient cement through the space between the bottom edge of the outer section and adjacent surface of the inner section, causing said nonresilient cement to fill the space between the sections not occupied by the resilient cement.

2. The method of constructing an insulator formed of a plurality of hollow porce-' lain sections, consisting of first placing a resilient cement within the outer section, nesting the sections and maintainingl an equal distance between the side walls t ereof while at the same time applying pressure between the sections to squeeze the resilient resilient cement through the space between the bottom edge of the outer section and the adjacent surface of the inner section so that it fills the space between thesections not occupied by the resilient cement.

In witness whereof. we have hereunto signed our names.

JOHN M. PECK. CORNELIUS VAN DYKE BENNETT. JAMES W. RYAN. 

